Dial



sepfN 18g-192s. 1,684,598

' .A. D. ROSE.

DIAL

Filed aan. so, 192s y I wzaandera pas@ Patented Sept. 18, 1928.

UNITED srres PATENT @FFME ALEXANDER D. ROSE, OF CHICAGO, ILLINOIS, ASSIGNOR IO JAS. I. MARSH 5c COM;

PANY, or CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

DIAL'.

Application filed January 30, 1926. Serial No. 84,907.

My invention relates to dials and particularly to dials adapted to be used upon gauges for indicating` variations in pressure.

A particular object ofthe 'invention is to provide an improved dial for a. pressure gauge, which dial has `the Zero so positioned that the pointer or dial of the gauge is in a substantially vertical position when indicating zero-pressure. l l

Another particular object of the invention is to provide improved dials for pressure gauges in Which dials the scaleswill be of maximum length for any given diameter.

l The invention has among its other objects the production of devices of the kind de scribed, Which are exceedingly lconvenient and satisfactory for use Wherever found applicable.

Still another particular object ofy the invention is to provide a dial which will unmistakably call the attention of an observer, in Whichone of a plurality of ranges of pressure, the instrument of which the dial forms a part is operating.

One form of the invention is embodied in a dial forming' part of a pressure gauge, the dial havng markings extending` through 360" Awhich indicate Avarious ranges of pressures in such manner that even an untrained observer will note in which one'of these a pointer formingpart of the dial is operating. The pointer or hand of the gauge assumes a substantially vertical position at atmos-` pheric pressure. j

Many other objects and advantages of the construction herein shown and described Will be obvious to those `skilled in the art from the disclosure herein given.

To this end my invention consists in the novel construction, arrangement and coinbination of parts herein shown and described. and moreparticularly pointed out in the claims.

'The drawing shows a gauge in elevation having` a dial embodying the invention.

Referring to thedrawing wherein I have shown a preferred form of the invention embodied in a dial which forms a part of the gauge adapted to indicate variations in pressure, the reference characterlO designates a casing which contains the mechanismof the gauge, the casing being. provided with a tubular fitting 11 whereby the gauge may be mounted upon a boiler or the equivalent. The tubular litting 11 carries and communicates With a Bourdon tube 14 Which is connected by a link 15 to a lever 16 pivoted at 18 and the lever 16 .is provided with gear teeth 19 which mesh with a pinion 2O rigidly secured upon `a shaft or pin 22 rotatably -iournaled in the casing 10. A` pointer vor hand 24 secured tothepin 22 is arranged to' be moved over a dial 25 provided with suitable markings. y

Briefly, the operation of the above described Vdevice is substantiallyas follows: Vihen the gauge is mounted upon a boiler, or the equivalent, a change of pressure in the boiler will cause the Bourdon tube 14 to cX- pand or contract, as the case may be, so that the lever 16 will rotate the pinionQO, the shaft 22 and thel pointer 24 into `a position wherein it will indicate upon the dial 25 the pressure Vobtaining Within the boiler.

lVith the exception of the dial 25, I am not concerned Withthe details or construction of the above described gauge and my invention is limited to suoli details only to the extent indicated in the appended claims.

In the illustrated embodiment of the invention, the dial 25 is adapted to indicate a range'ot pressures extending from atmospheric pressure to a pressure of pounds per square inch. However, it is to be understood that my invention is not limited to this particular range of pressures as the dial may be constructed to indicate any desired range of pressures. As shown, the dial is preferably provided With a plurality of radially disposed markings or lines 27 adapted to indicate pounds, every lfifth line 27 being made `heavier to facilitate thefreading ofthe dial which is' particularly adapted for use in steam-heating systems, or the equivalent, operated at relatively lovv pressures. j For this reason, the lirst five divisions of the dial are the divisions which indicate a range of pressures extending from atmospheric pressure to a pressure of 5 pounds per square inch and are provided with a plurality of radially ldisposed markings or liliesv 29 adapted to d ivide the divisons ,into spaces indicatingk a rise or fall of 2 ounces ofpressure.V It will be noted that the first -five divisions of the dial cannot he confused With the remainder of the divisions, as the remaining dial divisions ai'e preferably left undivided. Joining the inner ends of thelines 27 of the divisions which indicate pressures extending from at mospherie pressure to and including a pressure of l pounds per square inch is an arcuate line 30, which does not extend to the other lines 27. ()bviously, those divisions of the dial that indicate pressures extending from atmospheric pressure to and including a pressure oit pounds per square inch are clearly defined and cannot be confused with the divisions indicating higher pressures. To further differentiate between the divisions indicating pressures of 10 `pounds per square inch or less and the divisions indicating higher pressures, I preferably join the outer ends of the lines 27 of the divisions indicating said higher pressures by anarcuate line 32, which does not extend through the divisions marking the 4lower pressures. The line 32 is preferably broken as at 347-34 to give it a distinctive appearance. As apparatus upon which gauges of this character are employed is generally operated at or about a Certain pressure, I preferably indicate that pressure by a marking 35, or the equivalent, the marking 35 in this instance being a relatively large arrowlike marking pointing to that line 27 which indicates a pressure ot 2 pounds. It is, of course, understood that the marking' 35 may be arranged at any Vpoint upon the 'dial 25.

` I generally prefer to provide a pinV 37 against which the pointer 24 will rest when atmospheric pressure obtains Within the ourdon tube 14, the pin being also arranged to engage the pointer when it tends to pass in a clockwise direction from the divisions indicating high pressures to the divisions indicating low pressures. This prevents the pointer 24 from apparently indicating a relatively low pressure, when, in fact, it is indicating a pressure of more than 30 pounds per square inch.

It is obvious that an observer could not fail to note in which range of pressures the pointer 24` was operating, if the Vobserver but glance at the gauge, as thedivisions indicating pressures up to and including pounds per square inch are provided with the lines .29, which clearly distinguish these divisions irom the remaining dial divisions. the pointer happens to he positioned in the divisions indicating pressures from 5 pounds per square inch `up to and including l0 pounds per square inch,` the observer will readily notey the fact ,as the arcuate line 30 passes through these divisions. `Generally, a safety valve is operatively connected with the apparatus upon Vwhich the gauge is positioned, the safety valve being adapted to functionA at some predetermined pressure. In the illustrated embodiment of the invention this predetermined pressure Will be l() 4pounds per square inch. Obvious1y,when it Also, if

arrangement permits the zero t0 be posi-i tioned at the top of the dial so that the hand or pointer shown is in a substantially vertical position when atmospheric pressure obtains within the Bourdon tube. Heretofore, as far as I am aware, the dials for pressure gauges have had the zeros so positioned that the pointers o r the hands will be disposed at angles to the vertical when pointing tothe zero divisons. It has been the practice to compensate for the drag this occasions u on the Bourdon tube, or upon any equiva ent means used in place ofthe Bourdon tube, as considerable ditliculty has been experienced in having the pointer or hand return accu-V rately to the zero position when the pressure falls. I am aware that dials reading throu h 360 have been provided for scales and ,or other devices. but as far as Iknofw, no one has suggested producing a dial of thel charaeter described adapted for use upon pressure gauges.

Having thus described my invention, it is obvious that various immaterial modifications may be made in the same Without departing from' the spirit of my invention; hence I do not Wish to be understood as limitingmyself to the eXactform, construction, arrangement and combination of parts herein shown and described or uses mentioned.

that I claim as new and desire to secure by Letters Patent is;

l. A dial having a seriesy of radially disposed markings, symbols assigning values to saidmarkings, a line connecting the lower nrtrcmities of a portion only'of said'markings, and a second line connectedwith another series of said radially disposed mark- Vings and of dissimilar appearance to the .first named line, to thereby `strikingly conotlier seriesoil the markings.

2. A dial having a series of radially disposed markings, symbols assigning values to said markings, and a `line positioned adjacent the lower portions of only some of said markings, and a vsecondary line positrast one series of themarkings from antioned adjacentthe upper ends ofra portionl only of said markings, said lines contrastingdifferent portions of the series from Veach other.' i

3. A dial having a series of radially disposed markings, and a series ofsecondary sinallei'radial `markings interposed between a ,portion onlycof said lirst namedradial portions for permit-ting measurements of slight pressure variations for a predetermined initial zone of said first named markings, a line positioned near the upper portion of another portion of said radially disposed markings, to strikingly contrast one zone of said markings from another zone of said markings.

4T. A dial having a series of radially disposed markings, symbols assigning values to some of said markings, a line connecting' the lower extremities of at least a portion of said markings, and a second line connected with another series of said radially disposed markings, and of dissimilar disposition to the first named line to thereby strikingly contrast one rseries of the markings from another series of the markings.

5. A dial having a series of closely disposed radial markings, symbols assigning values to said markings, a second series ,of radially disposed markings spaced relatively further apart than the iirst named series, a

ALEXANDER D. ROSE. f 

